Automatic fuel-mixture regulator



A. A. LOETSCHER.

AUTOMATIC FUEL MIXTURE REGULATOR.

APPLICATION FILED MAR. 24. I920.

Patented Aug. 24, 1920.

INVENTOR eischer.

ATTORNEYS o A A 3 W/TI'VESSES UNITED STATES ALVIN ALBERT LOE'ISCHER, or IBILLINGS, memam. ASSIGNOR or ONE enoner. enoaenias, or BILLINGS, MONTANA.

:PATENT OFFICE.

HALF 'ro AUTOMATIC FUEL-MIXTURE REGULATOQ Application filed March 24, 1920. Serial No.

The present invention relates generally to internal combustion engines and more particularly to an automatic fuel feed regulator for internal combustion engines. i

In the type of internal combustion engine with which my invention is employed, fuel being supplied to the cylinder by the pumping effect of the piston, the velocity of the entering gases depends upon the engine speed, and as the draft diminishes it will not pick up as much fuel as when it is traveling at a higher rate. The present type of compensating carbureter, which is usually a carbureter provided with a Venturi type of mixing chamber provides for a sufliciently rapid flow of gas at low speed by constructing the mixing chamber bore at the spray nozzle so that the gas speed will be sufiiciently hi h when the engine is pumping slowly. he reduced diameter of the mixing chamber increases the velocity of the gases, because the cylinder must be filled through a smaller hole in a certain unit of time than would be the case if the bore were larger. Therefore, to insure a full supply reaching the cylinder, the gases must pass the top of the jet at a high rate of speed even if the piston is working slowly. In view of these features not enough air will be drawn in at high speed, and it is necessary to supply it through an auxiliary opening. Heretof ore in the art the means that have been employed to control the auxiliary opening so as to maintain it closed at low speeds while permitting it to open at high speeds have not been found effective and efiicient in practice.

An object of my invention is to provide an automatic fuel mixture regulator of this character under the control of and responsive to the speed of the engine to effectively vary the proportion of the hydrocarbon or other combustible and of the air whereby the fuel mixture or charge delivered to the cylinders is accurately proportioned and of proper composition to provide for perfect Specification of Letters Patent.

. of slightly increased Patented Aug. 24, 1920.

combustion and maximum power at all engme speeds.

Another object is to provide an improvement of th1s kind of simple and durable construct1on, h1ghly reliable in o eration, and eagy and inexpensive to manufacture.

ther obyects and advantages reside in the certain novel features of construction, arrangement, and combination of parts which Wlll become apparent as the description proceeds, reference being had to the ac company ng drawing, in which- Figure 1 1s a side elevational view show- 1n my improvement;

1g. 2 1s a vert cal longitudinal sectional View through my improvement; and

F 1g. 3 is a view on line 3-3 of Flg. 2.

Referring to the drawings, the numeral 5 deslgnates the cylinders of an internal combustlon engine which may be of any conventional type, and preferably embodies a crank shaft 6, crank case 7, a pump shaft 8 geared to the crank shaft and driven therefrom for actuating the pump 9, used in connectlon with the cooling system. An intake manifold 10 leads to the cylinders of the engine, and communicating with the manifold is an induction pipe 11 from the cartbureter 12, preferably of standard construc- Between the carbureter and the intake manifold, as shown in Fig. 1, the induction 11 is provided with an auxiliary air inlet p1pe 13. The outer end of the auxiliary air inlet pipe 13 is connected to a short pipe 14 internal and external dlameters. If desired this pipe 14 may be formed integral with the inlet pipe 13 and constitute an enlargement thereof. The outer end of the enlargement 14 of the inlet pipe is closed as shown at 15. Adjacent this outer closed end the pipe 14 is provided with a plurality of radial ports 16, preferably four in number. The inlet pipe 14 is mounted on a bracket 17 secured to the engine. The outer surface of the pipe 14 is machined to constitute a bearing, and rotatably mounted upon this hearing is a sleeve 18 having integrally formed therewith at its outer end a disk 19. The sleeve and disk are free to rotate on the pipe 14 but are constrained against longitudinal motion neath the disk '19 the sleeve is provided with an annular recess 21, which, when the sleeve is assembled upon the pipe 14, communicates directly with the radial ports 16 of the pipe. The disk 19 is provided with a plurality of radial bores or openings 22 communicating at their inner ends with the annular recesses 21 and communicating at their outer ends with the atmosphere. Annular flanges 23 are formed on the marginal edges of the periphery of the disk and at diametrically opposite points on these flanges are secured pivot pins 24. Valves 25'are adapted to cooperate with the outer ends of the radial bores of the diskand these valves are provided with curved valve stems 26 mounted upon the pivots 24. The curved valve stems 26 are of substantially arcuate form and they are normally disposed between the spaced flanges 23. ,The valves 25 are constructed of material of such mass as to provide foreflective centrifugal action as will hereafter appear. The valves 25 are each provided wlth lateral arms 27 alined radially with lugs 28, preferably formed integrall with the disk on the outer facetliereof. ach of the radial arms 27 are provided with an adjustment screw and nut 29 and 30, respectively, and a retractile spring 31 has one of its ends secured to the lug and its opposite end secured to the adjustment screw of, the radial arm. Such an arrangement is provided for each of the valves 26. The retractile sprin 31 tend to maintain the valves 25 in closed position shutting off communication between the radial bore and the atmosphere and reventing admission of air to the manifold t rough the auxiliary air inlet pipe. 7 v

A pulley 32 is keyed or otherwise secured to the sleeve 18 and alined therewith is apulley 33 keyed to the pump shaft 8. A suitable belt 34 transmits the drive from the pump shaft to the sleeve through the medium of the pulley.

Inoperation,- at low engine speeds, the speed with which the sleeve 18 revolves is correspondingly low. and the retractile s ring 31 maintains the valves 25 closed.

s the speed of the engine increases the speed with which the sleeve 18 is rotated is increased and the centrifugal force influencing the valves 25 becomes greater than the retractile action of the sprmgs 31 and. the valves 25 are thereby thrown outwardly.

ermitting ingress of air through the auxiliary air inlet pipe to the manifold. Should the engine slow down the value of, the centhese valves close.

I claim: 1. In a device of the character described, an internal combustion engine, a fuel supto the disk, means for rotating sai ply thereto including an intake manifold an auxiliary air inlet pipe to said manifold having an inlet port, a sleeve rotatably mounted on said inlet ipe and having an annular recess on its inner periphery for communication with the inlet port of said and provided with radial openings communicating with said annular recesses and with the atmosphere and having spaced annular flanges on its periphery, a valve cooperating with the outer end'of said radial opening ,having a curved valve stem pivoted to the flanges of the disk, means for rotatin said sleeve including a pulley secured hereto and a pulley driven from the crank shaft inlet pipe, a disk integral with said sleeve of the engine, a retractile spring for mainan internal combustion engine, a fuel supply thereto including an intake manifold, an aux liary air inlet pipe to said manifold having an inlet port, a sleeve rotatably mounted on said inlet pipe and having an annular recess on' its inner periphe for communication with the inlet port o i said inlet pipe, 2. disk integral with said sleeve and provided with radial openings communicating with said annular recesses and with the atmosphere and having spaced annular flanges on its periphery, a valve cooperatin with the outer end of said radial open1n aving a curved valve stem pivoted to the anges of the disk, means for rotating said sleeve including a pulley secured thereto and a pulley driven from the crank shaft of the engine, and a retractile s ring for maintaining said valve closed at ow s ed and (permitting said valve to open at high spee 3. an internal combustion engine, a fuel supply thereto including an intake manifold, an auxlliary air inlet pipe to said manifold having an inlet port, a sleeve rotatably mounted on'said inlet pipe and having an annular recess on its inner periphe for communication with the inlet port 0 said inlet pipe, 9. disk integral with said sleeve and provided with radial openings communicating with said annular recesses and with the atmosphere, and having spaced an- In a device of the character described, 7

nular flanges on its periphery, a valve 00- operating with the outer end of said radial opening having a curved valve stem (pivoted sleeve including a pulley secured thereto and a pulley driven from the crank shaft of the engine, a retractile spring for maintaining said valve closed at low speed and permitting said valve to open at high speed.

1. In a device of the character described, a fuel supply including an intake manifold an auxiliary air inlet pipe to said manifold having an inlet port, a sleeve rotatably mounted on said inlet pipe having an annular recess on its inner periphery communicating with said inlet port, a disk integral with said sleeve havinga radial opening communicating with said annular recess and with the atmosphere, a valve controlling said radial opening having a curved valve stem pivoted to said disk, and means for driving said sleeve from the crank shaft of the engine.

5. In a device of the character described, an internal combustion engine, a fuel supply therefor including an mtake manifold, an auxiliary air inlet pipe to said manifold having an inlet port, a rotary element journaled on said inlet pipe and having an inlet port leading from its periphery to the inlet port of said pipe, a valve for controlling the port of said rotary element and having a curved valve stem pivoted to the rotary element, means for maintaining the valve in closed position at low speed and means for driving said rotary element from the crank shaft to the engine.

6. In a device of the character described, an internal combustion engine, a fuel supply thereof including an intake manifold, an auxiliary air inlet pipe to said manifold having an inlet port, a rotary element jour naled on said inlet pipe and provided with an inlet port leading from its periphery to the inlet port of said pipe and having spaced annular flan es on its periphery, a valve'for controlling t e port of said rotary element having a curved valve stem pivoted to said spaced annular flanges, means for maintaining the valve in closed position at low speed, and means for driving said rotary element from the drive shaft to the engine.

7. In a device of the character described, a fuel supply including an intake manifold, an auxiliary air inlet pipe to said manifold having an inlet port, a rotary sleeve mounted on said inlet pipe having an annular recess on its inner periphery communicating with said inlet port, a disk integral with said sleeve having a radial opening communicating with said annular recess and with the atmosphere, and a valve controlling said radial opening having a curved valve stem pivoted to said disk.

ALVIN ALBERT LOETSGHER.

Witness:

J.-W. SNELLBAGHER. 

